/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "uv.h"
#include "internal.h"

#include <assert.h>
#include <stdint.h>
#include <errno.h>

#include <ifaddrs.h>
#include <net/if.h>
#include <net/if_dl.h>

#include <mach/mach.h>
#include <mach/mach_time.h>
#include <mach-o/dyld.h> /* _NSGetExecutablePath */
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <unistd.h> /* sysconf */

int uv__platform_loop_init(uv_loop_t* loop)
{
    loop->cf_state = NULL;

    if (uv__kqueue_init(loop))
        return -errno;

    return 0;
}

void uv__platform_loop_delete(uv_loop_t* loop)
{
    uv__fsevents_loop_delete(loop);
}

uint64_t uv__hrtime(uv_clocktype_t type)
{
    static mach_timebase_info_data_t info;

    if ((ACCESS_ONCE(uint32_t, info.numer) == 0 || ACCESS_ONCE(uint32_t, info.denom) == 0) && mach_timebase_info(&info) != KERN_SUCCESS)
        abort();

    return mach_absolute_time() * info.numer / info.denom;
}

int uv_exepath(char* buffer, size_t* size)
{
    /* realpath(exepath) may be > PATH_MAX so double it to be on the safe side. */
    char abspath[PATH_MAX * 2 + 1];
    char exepath[PATH_MAX + 1];
    uint32_t exepath_size;
    size_t abspath_size;

    if (buffer == NULL || size == NULL || *size == 0)
        return -EINVAL;

    exepath_size = sizeof(exepath);
    if (_NSGetExecutablePath(exepath, &exepath_size))
        return -EIO;

    if (realpath(exepath, abspath) != abspath)
        return -errno;

    abspath_size = strlen(abspath);
    if (abspath_size == 0)
        return -EIO;

    *size -= 1;
    if (*size > abspath_size)
        *size = abspath_size;

    memcpy(buffer, abspath, *size);
    buffer[*size] = '\0';

    return 0;
}

uint64_t uv_get_free_memory(void)
{
    vm_statistics_data_t info;
    mach_msg_type_number_t count = sizeof(info) / sizeof(integer_t);

    if (host_statistics(mach_host_self(), HOST_VM_INFO,
            (host_info_t)&info, &count)
        != KERN_SUCCESS) {
        return -EINVAL; /* FIXME(bnoordhuis) Translate error. */
    }

    return (uint64_t)info.free_count * sysconf(_SC_PAGESIZE);
}

uint64_t uv_get_total_memory(void)
{
    uint64_t info;
    int which[] = { CTL_HW, HW_MEMSIZE };
    size_t size = sizeof(info);

    if (sysctl(which, 2, &info, &size, NULL, 0))
        return -errno;

    return (uint64_t)info;
}

void uv_loadavg(double avg[3])
{
    struct loadavg info;
    size_t size = sizeof(info);
    int which[] = { CTL_VM, VM_LOADAVG };

    if (sysctl(which, 2, &info, &size, NULL, 0) < 0)
        return;

    avg[0] = (double)info.ldavg[0] / info.fscale;
    avg[1] = (double)info.ldavg[1] / info.fscale;
    avg[2] = (double)info.ldavg[2] / info.fscale;
}

int uv_resident_set_memory(size_t* rss)
{
    mach_msg_type_number_t count;
    task_basic_info_data_t info;
    kern_return_t err;

    count = TASK_BASIC_INFO_COUNT;
    err = task_info(mach_task_self(),
        TASK_BASIC_INFO,
        (task_info_t)&info,
        &count);
    (void)&err;
    /* task_info(TASK_BASIC_INFO) cannot really fail. Anything other than
   * KERN_SUCCESS implies a libuv bug.
   */
    assert(err == KERN_SUCCESS);
    *rss = info.resident_size;

    return 0;
}

int uv_uptime(double* uptime)
{
    time_t now;
    struct timeval info;
    size_t size = sizeof(info);
    static int which[] = { CTL_KERN, KERN_BOOTTIME };

    if (sysctl(which, 2, &info, &size, NULL, 0))
        return -errno;

    now = time(NULL);
    *uptime = now - info.tv_sec;

    return 0;
}

int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count)
{
    unsigned int ticks = (unsigned int)sysconf(_SC_CLK_TCK),
                 multiplier = ((uint64_t)1000L / ticks);
    char model[512];
    uint64_t cpuspeed;
    size_t size;
    unsigned int i;
    natural_t numcpus;
    mach_msg_type_number_t msg_type;
    processor_cpu_load_info_data_t* info;
    uv_cpu_info_t* cpu_info;

    size = sizeof(model);
    if (sysctlbyname("machdep.cpu.brand_string", &model, &size, NULL, 0) && sysctlbyname("hw.model", &model, &size, NULL, 0)) {
        return -errno;
    }

    size = sizeof(cpuspeed);
    if (sysctlbyname("hw.cpufrequency", &cpuspeed, &size, NULL, 0))
        return -errno;

    if (host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &numcpus,
            (processor_info_array_t*)&info,
            &msg_type)
        != KERN_SUCCESS) {
        return -EINVAL; /* FIXME(bnoordhuis) Translate error. */
    }

    *cpu_infos = uv__malloc(numcpus * sizeof(**cpu_infos));
    if (!(*cpu_infos)) {
        vm_deallocate(mach_task_self(), (vm_address_t)info, msg_type);
        return -ENOMEM;
    }

    *count = numcpus;

    for (i = 0; i < numcpus; i++) {
        cpu_info = &(*cpu_infos)[i];

        cpu_info->cpu_times.user = (uint64_t)(info[i].cpu_ticks[0]) * multiplier;
        cpu_info->cpu_times.nice = (uint64_t)(info[i].cpu_ticks[3]) * multiplier;
        cpu_info->cpu_times.sys = (uint64_t)(info[i].cpu_ticks[1]) * multiplier;
        cpu_info->cpu_times.idle = (uint64_t)(info[i].cpu_ticks[2]) * multiplier;
        cpu_info->cpu_times.irq = 0;

        cpu_info->model = uv__strdup(model);
        cpu_info->speed = cpuspeed / 1000000;
    }
    vm_deallocate(mach_task_self(), (vm_address_t)info, msg_type);

    return 0;
}

void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count)
{
    int i;

    for (i = 0; i < count; i++) {
        uv__free(cpu_infos[i].model);
    }

    uv__free(cpu_infos);
}

int uv_interface_addresses(uv_interface_address_t** addresses, int* count)
{
    struct ifaddrs *addrs, *ent;
    uv_interface_address_t* address;
    int i;
    struct sockaddr_dl* sa_addr;

    if (getifaddrs(&addrs))
        return -errno;

    *count = 0;

    /* Count the number of interfaces */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) || (ent->ifa_addr == NULL) || (ent->ifa_addr->sa_family == AF_LINK)) {
            continue;
        }

        (*count)++;
    }

    *addresses = uv__malloc(*count * sizeof(**addresses));
    if (!(*addresses)) {
        freeifaddrs(addrs);
        return -ENOMEM;
    }

    address = *addresses;

    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
            continue;

        if (ent->ifa_addr == NULL)
            continue;

        /*
     * On Mac OS X getifaddrs returns information related to Mac Addresses for
     * various devices, such as firewire, etc. These are not relevant here.
     */
        if (ent->ifa_addr->sa_family == AF_LINK)
            continue;

        address->name = uv__strdup(ent->ifa_name);

        if (ent->ifa_addr->sa_family == AF_INET6) {
            address->address.address6 = *((struct sockaddr_in6*)ent->ifa_addr);
        } else {
            address->address.address4 = *((struct sockaddr_in*)ent->ifa_addr);
        }

        if (ent->ifa_netmask->sa_family == AF_INET6) {
            address->netmask.netmask6 = *((struct sockaddr_in6*)ent->ifa_netmask);
        } else {
            address->netmask.netmask4 = *((struct sockaddr_in*)ent->ifa_netmask);
        }

        address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);

        address++;
    }

    /* Fill in physical addresses for each interface */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) || (ent->ifa_addr == NULL) || (ent->ifa_addr->sa_family != AF_LINK)) {
            continue;
        }

        address = *addresses;

        for (i = 0; i < (*count); i++) {
            if (strcmp(address->name, ent->ifa_name) == 0) {
                sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
                memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
            }
            address++;
        }
    }

    freeifaddrs(addrs);

    return 0;
}

void uv_free_interface_addresses(uv_interface_address_t* addresses,
    int count)
{
    int i;

    for (i = 0; i < count; i++) {
        uv__free(addresses[i].name);
    }

    uv__free(addresses);
}
